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rust-rocksdb/tests/test_slice_transform.rs

51 lines
1.6 KiB

extern crate rocksdb;
mod util;
use rocksdb::{DB, Options, SliceTransform};
use util::DBName;
#[test]
pub fn test_slice_transform() {
let n = DBName::new("_rust_rocksdb_slicetransform_test");
{
let a1: Box<[u8]> = key(b"aaa1");
let a2: Box<[u8]> = key(b"aaa2");
let b1: Box<[u8]> = key(b"bbb1");
let b2: Box<[u8]> = key(b"bbb2");
fn first_three(k: &[u8]) -> Vec<u8> {
k.iter().take(3).cloned().collect()
}
let prefix_extractor = SliceTransform::create("first_three", first_three, None);
let mut opts = Options::default();
opts.create_if_missing(true);
opts.set_prefix_extractor(prefix_extractor);
let db = DB::open(&opts, &n.name).unwrap();
assert!(db.put(&*a1, &*a1).is_ok());
assert!(db.put(&*a2, &*a2).is_ok());
assert!(db.put(&*b1, &*b1).is_ok());
assert!(db.put(&*b2, &*b2).is_ok());
fn cba(input: &Box<[u8]>) -> Box<[u8]> {
input.iter().cloned().collect::<Vec<_>>().into_boxed_slice()
}
fn key(k: &[u8]) -> Box<[u8]> { k.to_vec().into_boxed_slice() }
{
let expected = vec![(cba(&a1), cba(&a1)), (cba(&a2), cba(&a2))];
let a_iterator = db.prefix_iterator(b"aaa");
assert_eq!(a_iterator.collect::<Vec<_>>(), expected)
}
{
let expected = vec![(cba(&b1), cba(&b1)), (cba(&b2), cba(&b2))];
let b_iterator = db.prefix_iterator(b"bbb");
assert_eq!(b_iterator.collect::<Vec<_>>(), expected)
}
}
}